A method for producing a low-cost high-surface-quality galvanized hot-formed steel sheet

Abstract

This invention belongs to the field of metallurgical technology, and particularly relates to a low-cost, high-surface-quality galvanized hot-formed steel sheet production method. It includes the following steps: S1, using hot-rolled steel strip as raw material, controlling the coiling temperature of the hot-rolled steel strip to ≤550℃ through segmented laminar flow cooling; S2, pickling the hot-rolled steel strip using a composite pickling solution; S3, continuously galvanizing the pickled hot-rolled steel strip, wherein the heating temperature before galvanizing is ≤600℃. This invention eliminates the cold rolling and high-temperature annealing processes, fundamentally avoiding the internal oxidation defects of high-alloy hot-formed steel. The resulting steel sheet has a smooth surface without pitting or incomplete coating, and the interface between the coating and the substrate is clear and uniform. Simultaneously, the composite pickling solution improves pickling efficiency and reduces HCl volatilization. This invention has advantages such as low cost, high surface quality, and strong alloy adaptability.

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